I'm just curious to know about how the current AM window frequencies were determined.
The one for 15 meters appears to have drifted up and down the band over several years. I recall it being 21.330 one year, then 21.390, 21.415, 21.430, and now apparently 21.425. I'm delighted to see the recent attempts at activity on 15 meters, and will make additional comments relative to that band later. Mike Duke, K5XU
